Mixing axis controls?

[Cfin]

I have finally settled on the model of VMC I require and have a question for you guys that perhaps you can help with.
I need a 4525 with extended Z, (which appears to be a "younger" machine) and was previously informed, I definitely need a good quality rotary table for my usage.... a Nikken was suggested.
I stumbled across a new table for sale for a good price so I brought it, only "problem" being it has a DC motor (for Fadal).
My question is - The 4525 looks like it will have brushless AC servo motors from the factory, is it possible to mix axis drive cards/amps (i.e is it possible to have the other three axis, AC as per factory .... but install a DC controller for the 4th axis and run it DC) ??

Failing that, I guess the only alternative is a motor change ?

[iess525]

It would be easier to change the motor from DC to AC on the rotary table. It would be a lot of work and money to get the machine to handle the DC rotary table. You'd have to get a DC chassis just for the rotary table.

[denmar]

jjj

[Cfin]

The two posts seem to contradict each other....??

It does sound strange that a machine would be produced with a mix of AC (x and y) and DC servo motor for the 4th though. Would complicate things for the manufacturer ??

[little bubba]

Originally Posted by Cfin The two posts seem to contradict each other....?? It does sound strange that a machine would be produced with a mix of AC (x and y) and DC servo motor for the 4th though. Would complicate things for the manufacturer ??

Had a '97 that was AC on XYZ and DC on the 4th, came from the factory that way, so it can be done.

[Neal]

Denmar--
All Fadal rotaries are NOt just DC. There are AC rotaries that Fadal supplies. Take note of VH-165, VH-225, VH-275, V300, V400, and TR-165 are all AC servos.
Although it is possible to install a DC rotary on an AC servo machine, I have to agree with iess525 that retrofitting an AC motor to the rotary is the best solution.

Neal

[Cfin]

I get it now, thanks for your comments.
Its going to depend on which machine I end up with whether I have the problem or not.... it might not be a 4525, but it is the most "attractive" from the performance/features side of things.